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x in (-oo:+oo)
((x+2)^2)/3 = 9 // - 9
((x+2)^2)/3-9 = 0
((x+2)^2)/3+(-9*3)/3 = 0
(x+2)^2-9*3 = 0
x^2+4*x-23 = 0
x^2+4*x-23 = 0
x^2+4*x-23 = 0
DELTA = 4^2-(-23*1*4)
DELTA = 108
DELTA > 0
x = (108^(1/2)-4)/(1*2) or x = (-108^(1/2)-4)/(1*2)
x = (6*3^(1/2)-4)/2 or x = (-6*3^(1/2)-4)/2
(x-((-6*3^(1/2)-4)/2))*(x-((6*3^(1/2)-4)/2)) = 0
((x-((-6*3^(1/2)-4)/2))*(x-((6*3^(1/2)-4)/2)))/3 = 0
((x-((-6*3^(1/2)-4)/2))*(x-((6*3^(1/2)-4)/2)))/3 = 0 // * 3
(x-((-6*3^(1/2)-4)/2))*(x-((6*3^(1/2)-4)/2)) = 0
( x-((-6*3^(1/2)-4)/2) )
x-((-6*3^(1/2)-4)/2) = 0 // + (-6*3^(1/2)-4)/2
x = (-6*3^(1/2)-4)/2
( x-((6*3^(1/2)-4)/2) )
x-((6*3^(1/2)-4)/2) = 0 // + (6*3^(1/2)-4)/2
x = (6*3^(1/2)-4)/2
x in { (-6*3^(1/2)-4)/2, (6*3^(1/2)-4)/2 }
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